• Journal of Energy Engineering
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• v.15 no.4 s.48
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• pp.284-290
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• 2006

The improvement of energy recovery is mandatory to decrease consumption of fossil fuels and to minimize negative impacts on the environment which originates from large cooling and heating demand. The absorption heat pump technology has a large potential for energy saving in this respect. Absorption heat pump is a means to upgrade waste heat without addition of extra thermal energy. In this study, resorption heat pump for energy recovery has been investigated using methanol-glycerine. The simulated calculation of theoretical thermal efficiency was performed based on the thermodynamic properties of the working fluid over various operating conditions. The thermal efficiency of higher than 0.4 was obtained by raising industrial waste heat, $70{\sim}80^{\circ}C$, by $40^{\circ}C$ in this system.

• Clean Technology
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• v.3 no.1
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• pp.82-87
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• 1997

A resorption heat pump for energy recovery leas been investigated using methanol-glycerine. The calculation of the theoretical thermal efficiency for the resorption heat pump was carried out based on the thermodynamic properties of this working pair over various operating conditions for each part of the system. More than 40% of the thermal efficiency can be obtained by raising industrial waste heats ($60{\sim}70^{\circ}C$) by $40^{\circ}C$ using the resorption heat pump cycle.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.14 no.10
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• pp.775-780
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• 2002

An experimental study on the characteristics of several kinds of packing materials was carried out in order to get the optimum design data for the packed-type rectification system of an NH$_3$/$H_2O$ GAX absorption heat pump. Several suitable packing materials were examined and the bulk of steel wire was shown as the most effective packing material in rectifier. The optimum volumetric ratio of packed steel wire in rectifier was obtained as around 36%. The performance results can be adapted in rectifier design of absorption heat pump.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.125-125
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• 2017

본 연구에서 원추형 태양열 집광기의 흡수관 표면의 흑색 도색 여부에 따른 효율분석을 수행하였다. 원추형 집광기 시스템은 열 손실 최소화 및 집광비가 우수한 $45^{\circ}$의 원추각을 갖는 원추형 집광기를 설계 및 제작하였다. 원추형 태양열 집광시스템은 열매체 축열을 위한 온도센서가 내장된 축열조와 태양에너지를 집열시키는 원추형 집광기, 유량측정을 위한 유량계, 열매체의 강제순환을 위한 펌프로 구성되어있다. 또한 지속적인 태양추적을 위해 2축 태양 추적 장치를 설치하였다. 흡수관은 원추형 집광기의 중심부에 설비되었으며, 열매체의 순환을 위해 이중 열교환기 구조로 제작되었다. 흡수관의 길이는 열 손실을 최소화하기 위하여 집광기의 높이와 동일하게 설계하였다. 원추형 집광시스템의 작동유체인 물은 펌프에 의해 흡수관과 축열조를 강제순환 하게되고, 용량이 70L인 축열조에 흡수관으로부터 흡수된 태양 복사열이 저장된다. 원추형 집광시스템의 성능실험은 청명한 날 유량 2L/min, 4L/min, 6L/min에 대해 수행되었으며, 집열효율을 계산하여 비교 및 분석하였다. 흑색으로 도색된 흡수기를 부착한 원추형 집광시스템의 집열효율은 82.25%로 나타났으며, 무 도색 흡수관을 갖는 원추형 집광시스템은 73.26%의 집열효율을 나타내었다. 따라서 본 연구를 통해 흡수관 표면의 흑색 도색이 원추형 집광시스템의 집열효율에 큰 영향을 미친다는 것을 알 수 있었다.